This is the Replacement Crankshaft for the O.S. Max .50 SX Engine. / This part rotates inside the engine and the moving parts attach to it. / / FEATURES: Steel construction / / INCLUDES: One crankshaft / / REQUIRES: Assembly into the engine. / / SPECS: Total Length: 92.8mm (3.66") / Connecting Rod Pin Length: 7mm (0.28") / Connecting Rod Pin Diameter: 6mm (0.24") / Crankshaft Bearing Diameter: 15mm (0.59") / Length of Threaded Portion: 21mm (0.83") / Crankshaft Threads: 1/4-28 / cmc 1/8/02 / ir/kh / Crankshaft Threads updtated tjt 050205